Heat oil in a saucepan over medium heat, sauté the onion, and add the cabbage, cooking until softened.

Add the Spring Mix, season with a little salt and pepper, and cook until thawed.

Add tomato purée and chipotle pepper, cook for 8 minutes, and adjust seasoning.

Spread refried beans on a tostada, add some tinga, sour cream, and grated cheese.